Ghost ship no more: Coast Guard contractor hauls derelict minesweeper from San Joaquin delta

A major environmental cleanup has been successfully completed in California’s Sacramento–San Joaquin Delta, where a Coast Guard contractor removed the HMCS Chaleur, a 140-foot wooden-hulled minesweeper, from Little Potato Slough near Stockton. Years of decay and heavy oil saturation have made the vessel have deteriorated, making it one of the most dangerous wrecks in the region. This final major extraction in a multi-year attempt focused at reducing environmental and navigational risks in the delta.

The History of the Chaleur

The HMCS Chaleur, originally serving in the Royal Canadian Navy from the 1950s until the late 1990s, was sold to private owners. Over time, it changed hands several times and ended up moored at a private marina that closed. Abandoned and neglected,, the ship deteriorated, with portions sinking into the water, creating ecological and navigation hazards. The wooden hull absorbed oil, posing a serious threat to the delta’s water quality and surrounding wildlife.

Acknowledging these dangers, the U.S. Coast Guard introduced a comprehensive cleanup under the supervision of Lt. Cmdr. Mark Leahey. Funded through the Oil Pollution Liability Trust Fund, the program focused on vessels that posed the greatest risk to public safety, wildlife, and water quality, with the Chaleur rapidly designated as a top priority.

The Removal Process

In July, Power Engineering Construction, a California-based contractor, was tasked to carry out the extraction. Using a crane barge and dive team worked together to dismantle the vessel section by section directly remaining in the water. Divers carefully cut the hull into manageable sections, which were then lifted onto the barge. This method reduced further environmental risk while ensuring oil and debris were safely contained and removed.

The removal follows earlier efforts to clear the slough of other derelict vessels, including the WWII Navy yard tug Mazapeta and the former cruise ship Aurora. With these operations completed, Little Potato Slough is now free of large wrecks, minimizing pollution risks and improving safety for all other waterway users.

Challenges in the Delta

Although the slough has been cleared of major wrecks, the broader Sacramento–San Joaquin Delta still has numerous abandoned vessels. Lt. Cmdr. Leahey noted that “dozens more wrecks throughout the Delta continue to pose environmental threats.” The Coast Guard intends to continue working with local authorities, environmental groups, and contractors to remove these remaining ships, concentrating primarily first on those with the greatest risk of pollution or navigational dangers.

FAQs:

Q1. What was the HMCS Chaleur?
A1. A 140-foot wooden-hulled minesweeper that served in the Royal Canadian Navy from the 1950s to the 1990s.

Q2. Where was the vessel located?
A2. Little Potato Slough near Stockton, in California’s Sacramento–San Joaquin Delta.